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Bananapi r4 follows a atf (arm-trusted firmware) flow for device bootup, by default flash memory is present in the device which will be loaded with BL1  and BL1 will be having bl2 address to load bl2 and make device up.

Device bootup flow as mentioned below 

draw.io Diagram
bordertrue
diagramNameBPIR4_Bootup_flow
simpleViewerfalse
width
linksauto
tbstyletop
lboxtrue
diagramWidth121
height311
revision1

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